Plenty of homes use water filtration systems these days, but how do they really work? This chemistry experiment explores how charcoal filters impurities from drinking water. Devise a water filtration system The Homeschool Scientist But do all of them respond in the same way? Test several types of plants to find out. You probably already know that many plants grow toward the light. Learn more: Biofilm at The Homeschool Scientist See if caffeine helps you type faster In this 7th grade science fair project, students build an apparatus to collect biofilm and then experiment with ways to reduce the amount of biofilm that accumulates over time. Learn more: Grow Box at Uplifting Mayhem Collect and control biofilm The Homeschool Scientistīacteria that accumulate on objects in the water form a substance called biofilm. Then, use it for all kinds of plant-based science fair ideas for 7th grade students. Learn more: Flexibility Experiment at We Have Kids Construct a DIY Grow Box Uplifting Mayhemĭesign a grow box using a cardboard box, foil, and plug-in light socket. This is a great experiment for fitness fans. Stretch your mind with a flexibility experiment We Have Kidsįind out how important stretching really is by comparing the flexibility of willing test subjects before and after stretch exercises. Then, turn it into an experiment by applying the theory to other fruits or vegetables to see if you can get similar results. Learn how to extract DNA from an onion (most of what you need you can find at home, and you can get 95% ethanol at Amazon).
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